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Numerical study on the oscillation of a transient bubble near a confined free surface for droplet generation

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Abstract

In the present work, the oscillation of a spark-created bubble near a confined water–air interface and the ensuing droplet generation and ejection are studied numerically using the boundary element method. The interface is accorded by the top opening of either one of the following symmetrical configurations, which are distinguished by the value of angle between their vertical symmetry axis and lateral wall (i.e., θ): (i) a centrally perforated horizontal flat plate (θ = 90°) and (ii) vertically placed cylinder (θ = 0°), nozzle (θ > 0°) and diffuser (θ < 0°). Furthermore, the influences of the effective parameters such as the strength parameter (i.e., the intensity of local energy input), the bubble-free surface distance (standoff distance) and the nozzle size on the bubble dynamics and droplet formation and ejection processes are investigated. It was found that the moment at which the bubble attained its maximum volume was advanced as θ increased. In addition, by decreasing θ the attraction of the bubble toward the free surface during its expansion phase and its migration from the free surface during its contraction phase became stronger. Furthermore, for the nozzle case, by increasing θ, the volume of the droplet was increased. It was also found that by increasing the strength parameter, the volume of the droplet increased and its pinch-off happened earlier. Finally, as the standoff distance was increased, the volume of the droplet increased and its pinch-off was delayed.

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Authors and Affiliations

  1. Faculty of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Noureyeh Saleki-Haselghoubi

  2. Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

    Mohammad Taghi Shervani-Tabar

  3. Aerospace Engineering Department, Sharif University of Technology, Tehran, Iran

    Mohammad Taeibi-Rahni

  4. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Mohammad Taeibi-Rahni

  5. Department of Mechanical Engineering, Urmia University of Technology, Urmia, Iran

    Abdolrahman Dadvand

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  1. Noureyeh Saleki-Haselghoubi
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  2. Mohammad Taghi Shervani-Tabar
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  3. Mohammad Taeibi-Rahni
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  4. Abdolrahman Dadvand
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Correspondence to Noureyeh Saleki-Haselghoubi.

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Saleki-Haselghoubi, N., Shervani-Tabar, M.T., Taeibi-Rahni, M. et al. Numerical study on the oscillation of a transient bubble near a confined free surface for droplet generation. Theor. Comput. Fluid Dyn. 28, 449–472 (2014). https://doi.org/10.1007/s00162-014-0323-8

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